Cephalopoda - Ammonitida

Alternative spelling: Haploceratoidea

Parent taxon: Ammonitina according to C. W. Wright et al. 1996

Sister taxa: Acanthocerataceae, Desmoceratidae, Engonoceratoidea, Eoderoceratoidea, Hildoceratoidea, Hoplitaceae, Kossmaticeratidae, Neokanabiceras, Perisphinctaceae, Perisphinctoidea, Psiloceratoidea, Pulchelliaceae, Silesitidae, Simoceratidae, Sphaeroceratoidea, Stephanocerataceae, Usseliceras

Subtaxa: Binneyitidae, Haploceratidae, Lissoceratidae, Oppeliidae

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Ecology: fast-moving nektonic carnivore